From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 862BEC433EF for ; Thu, 14 Jul 2022 22:16:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241051AbiGNWQn (ORCPT ); Thu, 14 Jul 2022 18:16:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36470 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232845AbiGNWQl (ORCPT ); Thu, 14 Jul 2022 18:16:41 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4BE394F65D; Thu, 14 Jul 2022 15:16:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1657837000; x=1689373000; h=message-id:subject:from:reply-to:to:cc:date:in-reply-to: references:content-transfer-encoding:mime-version; bh=mVQwO9QEzd5OsYdGTYrC/Ah0nwY6fA94AdPAZzAXcbU=; b=I+79d2cA+gvQesOsgc2UbqGsVc2XKEKxXr/ZpyRG1sarSzcdGyd1S/ql KuSQYepiHFjfMxtxR44rXF68zIIWBa8O7PnEfH9yNYeitgHsS3Ir8latf prNUZUqnU8QAyLQIvprihtI8mpUWdPnTEF8QCz9eC3wWRRB1ca3zWmTnG 0bm2Uv3CUjgOPR9ZPB1dglIWTY8PWolESm1o4uClQxnv5PuuLt95S5WZ+ oUFPpno9jEkkAb6a4+TSJg5J8l54e8yBwWcUvKDp8tNvSqi9PT3AcK5ZD tgUnzBpOJz5qr9lsQnMglcNaS0R9d5W7+AHy1OizWfxL1LSzBxD/ijwVj w==; X-IronPort-AV: E=McAfee;i="6400,9594,10408"; a="311299492" X-IronPort-AV: E=Sophos;i="5.92,272,1650956400"; d="scan'208";a="311299492" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jul 2022 15:16:39 -0700 X-IronPort-AV: E=Sophos;i="5.92,272,1650956400"; d="scan'208";a="722880444" Received: from kputtann-mobl1.amr.corp.intel.com ([10.212.211.20]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jul 2022 15:16:39 -0700 Message-ID: <472f7fc2d44d781edb64f19f9970fe50eec79c1f.camel@linux.intel.com> Subject: Re: PNP0501 serial driver takes almost 2 seconds to suspend/resume (printk issue) From: Todd Brandt Reply-To: todd.e.brandt@linux.intel.com To: John Ogness , Sergey Senozhatsky , Petr Mladek , rafael.j.wysocki@intel.com, len.brown@intel.com Cc: Andy Shevchenko , Linux Kernel Mailing List , "open list:SERIAL DRIVERS" , Steven Rostedt Date: Thu, 14 Jul 2022 15:16:39 -0700 In-Reply-To: <875yk0908j.fsf@jogness.linutronix.de> References: <12fb98fe27e23e3f74a139e5e8eb83a97a343372.camel@linux.intel.com> <51b9e2cc3baf61a604bd239b736ec2d12f1f6695.camel@linux.intel.com> <87czegxccb.fsf@jogness.linutronix.de> <045ebee30af2b80aaeace1dab18ecd113e3f17c7.camel@linux.intel.com> <87tu7qvx1q.fsf@jogness.linutronix.de> <87o7xwbuoy.fsf@jogness.linutronix.de> <87ilo1wdac.fsf@jogness.linutronix.de> <7d79e9877d63cdb74144f38d8736959281b562cc.camel@linux.intel.com> <875yk0908j.fsf@jogness.linutronix.de> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.44.1-0ubuntu1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2022-07-13 at 23:28 +0206, John Ogness wrote: > On 2022-07-13, Todd Brandt wrote: > > URGENT: Removing the commit FIXES the issue. > >=20 > > I just ran a 5.19.0-rc6 kernel with the offending commit removed > > and > > it fixed the problem completely on all 3 machines. >=20 > I believe to have found the issue. A patch was posted to bugzilla: >=20 > https://bugzilla.kernel.org/attachment.cgi?id=3D301413 >=20 > Please test this. Thanks. >=20 > John Ogness I ran with your fix on 30 systems. On the 7 machines where this problem appears, the patch fixes it completely. On the 23 machines where this problem does not appear, there are no issues or regressions. Fix verified, thank you!